worker: fix crash when SharedArrayBuffer outlives creating thread #29190
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Keep a reference to the
ArrayBuffer::Allocator
alive for at leastas long as a
SharedArrayBuffer
allocated by it lives.The tests are taken 1:1 from #28788.
Refs: #28788
Fixes: #28777
Fixes: #28773
Checklist
make -j4 test
(UNIX), orvcbuild test
(Windows) passes